All the docs related files (docs-app, doc-gen, content, etc)
are now to be found inside the `/aio` folder.
The related gulp tasks have been moved from the top level
gulp file to a new one inside the `/aio` folder.
The structure of the `/aio` folder now looks like:
```
/aio/
  build/         # gulp tasks
  content/       #MARKDOWN FILES for devguides, cheatsheet, etc
    devguides/
    cheatsheets/
  transforms/    #dgeni packages, templates, etc
  src/
    app/
    assets/
    content/    #HTML + JSON build artifacts produced by dgeni from /aio/content.
                #This dir is .gitignored-ed
  e2e/           #protractor tests for the doc viewer app
  node_modules/ #dependencies for both the doc viewer builds and the dgeni stuff
                #This dir is .gitignored-ed
  gulpfile.js   #Tasks for generating docs and building & deploying the doc viewer
```
Closes #14361
		
	
			
		
			
				
	
	
	
		
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	@cheatsheetSection
Class decorators
@cheatsheetIndex 5
@description
{@target ts}import { Directive, ... } from '@angular/core';{@endtarget}
{@target js}Available from the ng.core namespace{@endtarget}
@cheatsheetItem
syntax(ts):
@Component({...}) class MyComponent() {}|@Component({...})
syntax(js):
var MyComponent = ng.core.Component({...}).Class({...})|ng.core.Component({...})
description:
Declares that a class is a component and provides metadata about the component.
@cheatsheetItem
syntax(ts):
@Directive({...}) class MyDirective() {}|@Directive({...})
syntax(js):
var MyDirective = ng.core.Directive({...}).Class({...})|ng.core.Directive({...})
description:
Declares that a class is a directive and provides metadata about the directive.
@cheatsheetItem
syntax(ts):
@Pipe({...}) class MyPipe() {}|@Pipe({...})
syntax(js):
var MyPipe = ng.core.Pipe({...}).Class({...})|ng.core.Pipe({...})
description:
Declares that a class is a pipe and provides metadata about the pipe.
@cheatsheetItem
syntax(ts):
@Injectable() class MyService() {}|@Injectable()
syntax(js):
var OtherService = ng.core.Class( {constructor: function() { }}); var MyService = ng.core.Class( {constructor: [OtherService, function(otherService) { }]});|var MyService = ng.core.Class({constructor: [OtherService, function(otherService) { }]});
description:
{@target ts}Declares that a class has dependencies that should be injected into the constructor when the dependency injector is creating an instance of this class.
{@endtarget}
{@target js}
Declares a service to inject into a class by providing an array with the services, with the final item being the function to receive the injected services.
{@endtarget}